Question about Dan Newberry's OCW load development

[tpcollins]

I understand his OCW method to find the sweet spot where the shockwave is away from the muzzle when the bullet exits. But I don't understand his method of shooting in a round robin sequence rather than all shells for a specific charge at once.

Meaning if I loaded up 4 different loads, I would shoot one from each load at a different target. Then I would shoot the 2nd and 3rd loads in the same sequence. I actually do this but I don't know why other than just following his method.

I'm just not sure why shooting in a round robin procedure at several targets would be any different than shooting all shells for a load at once at the same target before moving to the next load. Unless it forces you to concentrate more, I have no idea why he suggests this procedure. Any help would be appreciated. Thanks.

 

[WWWJD]

Simply put, barrel heating. Shooting round robin let's you see the performance of your loads across a broad barrel temperature range, from cold bore to hot enough to mirage. If you're last batch shot the best through a hot barrel, it might shoot like crap cold bore, otherwise.

 

[ShootistPRS]

Fatigue is another reason for "round robin" sequence. If you fire each group then you might be tired or flinching by the time you fire the last sequence.

 

[tobnpr]

I would add to the above that fouling is another thing that gets "averaged" out...

I believe it's just a way of averaging out all the variables.

If you have the distance available it's good to ladder test as well.